US2025355231A1PendingUtilityA1
Zoom optical system, optical apparatus and method for manufacturing the zoom optical system
Est. expiryJan 31, 2039(~12.5 yrs left)· nominal 20-yr term from priority
G02B 15/1421G02B 15/16G02B 27/646G02B 15/1461G02B 13/18G02B 15/145113
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Claims
Abstract
A zoom optical system (ZL) comprises, in order from an object: a first lens group (G1) having a positive refractive power; and a second lens group (G2) having a negative refractive power, wherein upon zooming, a distance between the adjacent lens groups changes. The zoom optical system further comprises an aperture stop(S) disposed closer to an image than the second lens group (G2, and satisfies the following conditional expression:0.1<Df/Dr<0.90where Df: a distance to the aperture stop from a lens surface of the zoom optical system closest to an object in a wide angle end state, andDr: a distance from the aperture stop to a lens surface of the zoom optical system closest to the image in the wide angle end state.
Claims
exact text as granted — not AI-modified1 - 35 . (canceled)
36 . A zoom optical system comprising, in order from an object: a first lens group having a positive refractive power; a second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group; and a sixth lens group,
wherein upon zooming, a distance between the adjacent lens groups changes, and the third lens group includes a vibration-proof group that has a positive refractive power and is movable so as to have a displacement component in a direction perpendicular to an optical axis.
37 . The zoom optical system according to claim 36 , wherein
the following conditional expression is satisfied:
0.5
<
f
3
b
/
b
3
<
4
.
0
0
where f3b: a focal length of the vibration-proof group, and
f3: a focal length of the third lens group.
38 . The zoom optical system according to claim 36 , wherein
the following conditional expression is satisfied:
0.5
<
β
T
3
r
×
(
1
-
β
T
3
b
)
<
4.
where βT3r: a magnification of the lens groups consisting of lenses disposed closer to the image than the vibration-proof group in a telephoto end state, and
βT3b: a magnification of the vibration-proof group in the telephoto end state.
39 . The zoom optical system according to claim 36 , wherein the vibration-proof group includes a positive lens and a negative lens.
40 . The zoom optical system according to claim 36 , wherein
the third lens group consists of, in order from the object: a 3a group, a 3b group, and a 3c group, and the 3b group is the vibration-proof group.
41 . The zoom optical system according to claim 40 , wherein
the following conditional expression is satisfied:
0.20<(− f 3 c )/ f 3 b< 1.50
where f3c: a focal length of the 3c group, and f3b: a focal length of the vibration-proof group.
42 . The zoom optical system according to claim 41 , wherein the 3c group consists of a single lens.
43 . The zoom optical system according to claim 40 , wherein the 3a group consists of a positive single lens and the 3c group consists of a negative single lens.
44 . The zoom optical system according to claim 40 , wherein
the 3c group consists of a negative single lens, and the following conditional expression is satisfied:
-
1
.
5
0
<
(
R
3
c
2
+
R
3
c
1
)
/
(
R
3
c
2
-
R
3
c
1
)
<
5
.
5
0
where R3c1: a radius of curvature of an object-side lens surface of the negative single lens of the 3c group, and
R3c2: a radius of curvature of an image-side lens surface of the negative single lens of the 3c group.
45 . The zoom optical system according to claim 36 , wherein
the following conditional expression is satisfied:
3.
<
ft
/
fw
<
30.
where ft: a focal length of the zoom optical system in a telephoto end state, and
fw: a focal length of the zoom optical system in a wide angle end state.
46 . The zoom optical system according to claim 36 , wherein
the following conditional expression is satisfied:
35.
°
<
ω
w
<
75.
°
where ωw: a half angle of view of the zoom optical system in a wide-angle end state.
47 . The zoom optical system according to claim 36 , wherein
the following conditional expression is satisfied:
2.5
°
<
ω
t
<
15.
°
where ωt: a half angle of view of the zoom optical system in a telephoto end state.
48 . The zoom optical system according to claim 40 , further comprising a focusing lens group which is moved along an optical axis upon focusing, and
wherein the focusing lens group is disposed closer to an image than the vibration-proof group.
49 . The zoom optical system according to claim 40 , further comprising a focusing lens group which has a negative refractive power and is moved along an optical axis upon focusing, and
wherein the focusing lens group is disposed closer to an image than the third lens group.
50 . An optical apparatus, comprising the zoom optical system according to claim 36 mounted thereon.Join the waitlist — get patent alerts
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